$tan\left(7x\right)\:=\:1$
$\sen^{2}\theta-\cos^{2}\theta=1-2\cos^{2}\theta$
$\int\left(2x-4\right)e^xdx$
$3x+4b+4x+5x^3$
$\left(-7x^3-1+2x^{-2}\right)\left(2x^2-3\right)$
$\frac{-3x^3+8x-7}{x+2}$
$-25x+2x^3$
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